scholarly journals A Research of Islanding Detection Method for Distributed Generation: Mechanism, Merits and Demerits

2019 ◽  
Vol 8 (12S2) ◽  
pp. 508-520
Keyword(s):  
Energy Source ◽  
Distributed Generation ◽  
Detection Method ◽  
Islanding Detection ◽  
Grid Structure ◽  
Distribution Grid ◽  
Distributed Energy ◽  
Detection Schemes ◽  
Ideal Method ◽  
Global Heating

Renewable energy is substantially applied at the distribution grid in order to fulfill the electricity demand as well as addressing global heating issue caused by conventional energy source. However, application of the distributed energy source raises new concern in regards of unintentional islanding activity in which prompts grid protection issues hence, endangering utility worker’s safety. These several decades feature thousands of invention and innovation of anti-islanding method developed by researchers to satisfy the demand of grid protection. Therefore, this paper conducts an overview on several islanding detection schemes with concentration on the mechanism of the method, the merits as well as the demerits of the scheme. It is concluded that there is no ideal method developed as yet, but some of these methods or integration of them are able to be applied practically to specific distributed source and grid structure.

scholarly journals Over/Undervoltage and Undervoltage Shift of Hybrid Islanding Detection Method of Distributed Generation

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Manop Yingram ◽  
Suttichai Premrudeepreechacharn
Keyword(s):  
Control System ◽  
Distributed Generation ◽  
Hybrid Method ◽  
Detection Method ◽  
System Simulation ◽  
Detection Methods ◽  
Islanding Detection ◽  
Active Method ◽  
Passive Method ◽  
Simulation Results

The mainly used local islanding detection methods may be classified as active and passive methods. Passive methods do not perturb the system but they have larger nondetection zones, whereas active methods have smaller nondetection zones but they perturb the system. In this paper, a new hybrid method is proposed to solve this problem. An over/undervoltage (passive method) has been used to initiate an undervoltage shift (active method), which changes the undervoltage shift of inverter, when the passive method cannot have a clear discrimination between islanding and other events in the system. Simulation results on MATLAB/SIMULINK show that over/undervoltage and undervoltage shifts of hybrid islanding detection method are very effective because they can determine anti-islanding condition very fast.ΔP/P>38.41% could determine anti-islanding condition within 0.04 s;ΔP/P<-24.39% could determine anti-islanding condition within 0.04 s;-24.39%≤ΔP/P≤ 38.41% could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of-24.39% ≤ΔP/P ≤38.41% at which the control system of inverter injected a signal of undervoltage shift as necessary to check if the occurrence condition was an islanding condition or not.

Sequence Component-Based Improved Passive Islanding Detection Method for Distribution System with Distributed Generations

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
Bhatraj Anudeep ◽  
Paresh Kumar Nayak
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Low Cost ◽  
Rate Of Change ◽  
Islanding Detection ◽  
Detection Scheme ◽  
Small Power ◽  
Distributed Generations ◽  
Sequence Components ◽  
Detection Schemes

Abstract In distributed generation (DG) systems, the rate of change of voltage and the rate of change of frequency are the two most common and widely used simple and low-cost passive islanding detection schemes. Unfortunately, these passive islanding detection schemes find limitation for detecting the islandings that cause very small power imbalance. In this paper, an improved passive islanding detection scheme is proposed by using the two newly derived indices from the sequence components of the current signal with the conventional voltage and frequency parameters. The performance of the proposed scheme is tested for numerous islanding and non-islanding cases generated on IEEE Std 399–1997 and IEC microgrid model distribution system integrated with both inverter-interfaced and synchronous DGs through PSCAD/EMTDC. The obtained results confirm the effectiveness of the proposed scheme.

scholarly journals An Irregular Current Injection Islanding Detection Method Based on an Improved Impedance Measurement Scheme

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2474 ◽  
Author(s):  
Menghua Liu ◽  
Wei Zhao ◽  
Qing Wang ◽  
Songling Huang ◽  
Kunpeng Shi
Keyword(s):  
Distributed Generation ◽  
Detection Method ◽  
Impedance Measurement ◽  
Current Injection ◽  
Detection Methods ◽  
Impedance Change ◽  
Islanding Detection ◽  
Measurement Scheme ◽  
Voltage Change ◽  
Injection Methods

One class of islanding detection methods, known as impedance measurement-based methods and voltage change monitoring-based methods, are implemented through injecting irregular currents into the network, for which reason they are defined in this paper as irregular current injection methods. This paper indicates that such methods may be affected by distributed generation (DG) unit cut-in events. Although the network impedance change can still be used as a judgment basis for islanding detection, the general impedance measurement scheme cannot separate island events from DG unit cut-in events in multi-DG operation. In view of this, this paper proposes a new islanding detection method based on an improved impedance measurement scheme, i.e., dynamic impedance measurement, which will not be affected by DG unit cut-in events and can further assist some other equipment in islanding detection. The simulations and experiments verify the stated advantages of the new islanding detection method.

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